FEATURES

• The SPD-E1 Rate and Interface Converter enables E1 equipment to utilize two T1 transmission links, by converting any E1 frame (2.048 Mbps) into two T1 frames(1.544 Mbps). SPD-E1 is transparent to the E1 framing pattern.

• Jitter attenuation on each side guarantees smooth, jitter-free operation.

• T1 parameters include D4 or ESF framing and AMI or B8ZS codes. In the ESF format, T1 main link statistics are stored in memory, in compliance with both ANSI and AT&T standards, and may be retrieved by the service supplier, or by the user via the supervisory port.

• Timing options cover all timing situations. These include:
  • Transparent timing: T1 transmit clock of both links is locked to E1 receive clock, and E1 transmit clock is locked to T1-A receive clock.
  • Loopback timing: T1 transmit clock for both links is derived from T1-A receive clock. E1 transmit clock is derived from E1 receive clock.
  • Internal clock: Internal oscillator is the source for both E1 and T1 transmit clocks.
  • Station clock: The source for both the E1 and T1 transmit clocks is the framed/unframed all "1"s T1 (AMI).

• Independent elastic buffering in each direction compensates for short term deviations in timing sources. Buffer size is 16 E1 frames (4096 bits).

• The E1 frame (256 bits) is equally divided between both T1 frames, utilizing timeslots 1 to 16 of each T1 link. Spare bandwidth may accommodate an additional DTE data channel.

• Data rates for the data channel are selectable for any multiple of 56 or 64 kbps, up to 1024 kbps. The DTE channel interface is available as V.35 or RS-530/RS-422.

• Setup, control and monitoring of status and diagnostic information can be performed via an ASCII terminal. Setup of the basic unit can also be performed via internal jumpers. Automatic dial-up is also supported whenever an alarm event occurs.

• Diagnostic loopbacks, activated either from the front panel or from the ASCII terminal, include:
  • E1 loopback towards the local DTE;
  • T1 loopback on both links, towards the remote DTE;
  • T1 network line loopback with carrier code activated on each T1 link.

• SPD-E1 is available as a desktop unit, with rack mount hardware for mounting in a 19'' rack.

.SPECIFICATIONS 

• Converts an E1 frame into two T1 frames
• Enables E1 equipment to operate over T1 facilities
• Additional data channel: n x 56 or n x 64 kbps
• Transparent to E1 framing
• Controlled slip for buffer overflow/underflow
• Loopback capabilities
• Built-in CSUs on the T1 links
• T1 interface complies with AT&T TR-62411, PUB 54016
• E1 interface complies with ITU Rec. G.703, G.823
• 24 hour storage of T1 line diagnostics
• Automatic dial-up upon alarm event

SPD-E1/*/#
E1/T1 Rate and Interface Converter

ORDERING

SPD-E1/115/530
SPD-E1/115/V35
SPD-E1/48/530
SPD-E1/48/V35

APPLICATIONS